How many movies have Hiroyuki Watanabe and Itaru Era collaborated on?

They have worked on 9 movies together! Their first movie together was Hiroshima Yakuza War (2000) while their highest rated movie together was Sakurada Gate Incident (2010). They have not worked together since 虎の流儀　激突！燃える嵐の関門編 (2022). They are most known for their action films together.